WASHINGTON — This is the vaunted pitching on which the Mets’ 2019 fortunes rest?

Only hours after assistant general manager John Ricco stood pat with his best pitchers at the non-waiver trade deadline, expressing a desire to contend next season with a strong rotation, Steven Matz orchestrated an abomination against the Nationals that screamed “sell, sell, sell.”

In a historic implosion, the Mets lost 25-4 at Nationals Park.

The demolition — which included Jose Reyes entering in the eighth inning for his first career pitching appearance — was the worst loss in Mets history. It topped the Mets’ 26-7 loss to the Phillies on June 11, 1985 at Veterans Stadium.

“It’s a tough loss,” manager Mickey Callaway said. “It’s embarrassing. We have got to do better than that.”